IBM PC AT 5170 Technical Reference (March 1984)
The Technical Reference for the IBM Personal Computer AT (5170), First Edition (March 1984), is IBM's design reference for the AT as first shipped, with the type 1 system board. Minuszerodegrees.net lists its part number as 1502243; the reader's comment form at the back of this scan is numbered 1502494. The hosted PDF has 462 pages. Its BIOS listing is headed "TEST1 11/28/83", the source for the first AT BIOS, released as 01/10/84. The scan includes Technical Reference Update Number 4 (6138321, August 24, 1984), which replaces pages 1-27, 1-28, 1-28.1 and 1-28.2.
Contents
[edit | edit source]From the manual's contents list (pp. vii to ix):
- Section 1, System Board (1-1): description (1-3), memory and microprocessor (1-4), system performance (1-7), system timers (1-8), system interrupts (1-10), ROM and RAM subsystems (1-11, 1-12), DMA (1-12), the I/O channel (1-15), other circuits (1-30) including the speaker, the jumper, the display adapter switch and the variable capacitor (1-31) and the keyboard controller, real-time clock and CMOS RAM information (1-45), specifications (1-55), connectors (1-57) and logic diagrams (1-61)
- Section 2, Coprocessor (2-1): the 80287
- Section 3, Power Supply (3-1): inputs and outputs (3-3), output protection and the dummy load (3-4), output voltage sequencing (3-4), no-load operation and the power-good signal (3-5), fan-out and connectors (3-6)
- Section 4, Keyboard (4-1): interface, key code scanning, buffer, power-on reset and basic assurance test (4-4), commands from the system (4-5), scan codes (4-10), clock and data signals (4-14), layout (4-16), connector (4-23)
- Section 5, System BIOS (5-1): BIOS usage, keyboard encoding and extended codes, and the listing
- Section 6, Instruction Set (6-1): the 80286 and 80287 instructions
- Section 7, Characters, Keystrokes and Color (7-1)
- Section 8, Communications (8-1)
- Section 9, IBM Personal Computer Compatibility (9-1): hardware considerations, including what the AT does not support (9-5), and application guidelines
- Glossary, bibliography and index
What this manual does not contain
[edit | edit source]- It is not a service manual. It has no FRU part numbers, removal procedures or problem isolation charts; see IBM Hardware Maintenance Service (March 1986) and IBM Personal Computer Family Service Information Manual.
- The logic diagrams have no parts list or board placement drawing.
- Only the type 1 system board and the first BIOS. The type 2 board and the 06/10/85 BIOS are in the September 1985 edition. Neither edition covers the 8 MHz type 3 board.
What it settles
[edit | edit source]- The AT power supply's dc load requirements, the 1-second minimum off time, the 100 to 500 ms Power Good delay and the minimum sense levels of +4.5, −3.75, +10.8 and −10.4 V (pp. 3-3 to 3-6). IBM's 1989 service manual gives −4.3 V and −10.2 V for the negative rails.
- The dummy load and no-load behaviour: with no load the supply may switch off and need a power-on cycle, without damage (pp. 3-4, 3-5).
Pages that cite this document
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Download: IBM PC AT 5170 Technical Reference Mar84.pdf